City officials and residents, including Mayor Joshua J. Cohen, members of City Council, department directors and volunteers, are involved in the drill. The city is asking the public to be aware that activity around the following locations will be part of the exercise:

• The Water Treatment Plant at 260 Defense Hwy, between 7 a.m. and 11 a.m.

Prosecutors announced new indictments Monday of Baltimore jail staff, the same day a top corrections official testified in the federal corruption trial of eight inmates and corrections officers about the difficulty containing misconduct in the system.